Merge #14726: Use RPCHelpMan for all RPCs

fa5e0452e8 rpc: Documentation fixups (MarcoFalke)
fa91e8eda5 Use RPCHelpMan for all RPCs (MarcoFalke)
fa520e72f7 lint: Must use RPCHelpMan to generate the RPC docs (MarcoFalke)

Pull request description:

  The resulting documentation should not change unless the type in the oneline-summary was previously incorrect. (E.g. string vs bool)

Tree-SHA512: 4ff355b6a53178f02781e97a7aca7ee1d0d97ff348b6bf5a01caa1c96904ee33c704465fae54c2cd7445097427fd04c71ad3779bb7a7ed886055ef36c1b5a1d0

test/lint/lint-rpc-help.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Check that all RPC help texts are generated by RPCHelpMan.
+
+export LC_ALL=C
+
+EXIT_CODE=0
+
+# Assume that all multiline strings passed into a runtime_error are help texts.
+# This is potentially fragile, but the linter is only temporary and can safely
+# be removed early 2019.
+
+non_autogenerated_help=$(grep --perl-regexp --null-data --only-matching 'runtime_error\(\n\s*".*\\n"\n' $(git ls-files -- "*.cpp"))
+if [[ ${non_autogenerated_help} != "" ]]; then
+    echo "Must use RPCHelpMan to generate the help for the following RPC methods:"
+    echo "${non_autogenerated_help}"
+    echo
+    EXIT_CODE=1
+fi
+exit ${EXIT_CODE}